04 BOTANICAL GAZETTE [AUGUST 
Fics. 8—11.—Dioon spinulosum: c, cone domes; m, mucilage ducts; /, leaf traces; 
~, phloem; fig. 8, cone dome still separated from the main body of the stele; fig. 9, 
section at the union of cone dome and main body of stele; fig. 10, slightly more inti- 
mate union; fig. 11, longitudinal view of cone dome at point of union with main body 
of stele; all X5. 
